{ INFORMATICS.MCCME.RU
  Problem statement: http://informatics.mccme.ru/moodle/mod/statements/view3.php?chapterid=3063
  Verdict: Accepted
}
uses SysUtils, Math;
 
var
	ans,x,y,p:int64;
	i:extended;
 
begin
reset(input,'input.txt');
rewrite(output,'output.txt');
read(x,p,y);
i:=x;
ans:=0;
while i<y do begin
	i:=trunc((i*(1+p/100))*100)/100;
	inc(ans);
end;
write(ans);
end.